[tip: timers/vdso] elf, uapi: Add definition for STN_UNDEF

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The following commit has been merged into the timers/vdso branch of tip:

Commit-ID:     c4131140961b93883e69a01b09f8ed4bcebefaf1
Gitweb:        https://git.kernel.org/tip/c4131140961b93883e69a01b09f8ed4bcebefaf1
Author:        Thomas Weißschuh <thomas.weissschuh@xxxxxxxxxxxxx>
AuthorDate:    Wed, 26 Feb 2025 12:44:41 +01:00
Committer:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Mon, 03 Mar 2025 20:00:11 +01:00

elf, uapi: Add definition for STN_UNDEF

The definition is used by tools/testing/selftests/vDSO/parse_vdso.c.

To be able to build the vDSO selftests without a libc dependency,
add the definition to the kernels own UAPI headers.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Kees Cook <kees@xxxxxxxxxx>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
Acked-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Link: https://refspecs.linuxfoundation.org/elf/gabi4+/ch4.symtab.html
Link: https://lore.kernel.org/all/20250226-parse_vdso-nolibc-v2-2-28e14e031ed8@xxxxxxxxxxxxx
---
 include/uapi/linux/elf.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
index b44069d..448695c 100644
--- a/include/uapi/linux/elf.h
+++ b/include/uapi/linux/elf.h
@@ -125,6 +125,8 @@ typedef __s64	Elf64_Sxword;
 #define STB_GLOBAL 1
 #define STB_WEAK   2
 
+#define STN_UNDEF 0
+
 #define STT_NOTYPE  0
 #define STT_OBJECT  1
 #define STT_FUNC    2





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